Spectral lights that glow in places of death, such as churchyards. Norse sagas spoke of such lights at sacred burial spots, and reports of them have continued into modern times. Often the lights hover over the grave of a newly bured person, or else trace the route that the funeral procession is due to take. Sometimes it is said that the lights are warnings sent to the livng by dead friends and relatives to advise them that they are soon to die and should make the necessary preperations.